<Netsu>
yeah, any common tool for memory profiling of native debug builds
<def`>
statmemprof :P
<def`>
it is available as an opam switch
<Armael>
(that's for memory profiling)
<Armael>
but yeah for time I've used perf ("perf record" and "perf record --call-graph dwarf" to get call stacks) and it worked quite well
<Armael>
(having access to Pierre Chambard was also very helpful)
<def`>
but perf is only for time profiling
<Armael>
yes
<def`>
statmemprof & landmark are good and complementary for memory profiling
<def`>
(landmark will track the amount of allocation but won't say anything about lifetime, statmemprof is good for that)
<def`>
In my experience, statmemproof alone is good enough for finding problems. then landmark is useful to reveal some unexpected behaviors and confirm or infirm some hypotheses
<ggole>
Is that spacetime, or is there yet another profiling tool?
<def`>
it is another one, using statistical profiling so the overhead is very low
<def`>
(it is good enough that you can ship it in production without noticeable slowdown until the time you turn profiling on)
<ggole>
Mmm, ok
<ggole>
It seems like it should be possible to hide the profiling logic in the slow path of the allocation test and have no slowdown at all (until profiling is on), but perhaps that's hard to implement
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<def`>
It is the case.
<def`>
When I say not noticeable, it is way below the execution time noise.
<def`>
(The actual trick is to dynamically reduce the size of the minor heap to trigger the sampling profiler)
<ggole>
Yeah, that sounds sensible
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<ggole>
I was thinking that you do that with every allocation (when profiling is on), so that the test fails every time you get to a new allocation site, then in the profiler you record your info and then dole out exactly enough space for that allocation (so that it fails next time)
<ggole>
But just reducing the available space sounds easier.
<def`>
Yes.
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